scuffed-code/icu4c/source/i18n/unirange.h

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/*
**********************************************************************
* Copyright (C) {1999}, International Business Machines Corporation and others. All Rights Reserved.
**********************************************************************
* Date Name Description
* 11/17/99 aliu Creation.
**********************************************************************
*/
#ifndef UNIRANGE_H
#define UNIRANGE_H
#include "unicode/utypes.h"
class UnicodeString;
/**
* %%% INTERNAL CLASS USED BY RuleBasedTransliterator %%%
*
* A range of Unicode characters. Support the operations of testing for
* inclusion (does this range contain this character?) and splitting.
* Splitting involves breaking a range into two smaller ranges around a
* character inside the original range. The split character is not included
* in either range. If the split character is at either extreme end of the
* range, one of the split products is an empty range.
*
* This class is used internally to determine the largest available private
* use character range for variable stand-ins.
*/
class UnicodeRange {
public:
UChar start;
int32_t length;
UnicodeRange(UChar start, int32_t length);
/**
* CALLER OWNS RESULT.
*/
UnicodeRange* clone() const;
UBool contains(UChar c) const;
/**
* Assume that contains(c) is true. Split this range into two new
* ranges around the character c. Make this range one of the new ranges
* (modify it in place) and return the other new range. The character
* itself is not included in either range. If the split results in an
* empty range (that is, if c == start or c == start + length - 1) then
* return null.
*
* MODIFIES THIS RANGE IN PLACE.
*
* CALLER OWNS RESULT.
*/
UnicodeRange* split(UChar c);
/**
* Finds the largest subrange of this range that is unused by the
* given string. A subrange is unused by a string if the string
* contains no characters in that range. If the given string
* contains no characters in this range, then this range itself is
* returned.
*
* CALLER OWNS RESULT.
*/
UnicodeRange* largestUnusedSubrange(const UnicodeString& str) const;
private:
// For UVector of UnicodeRange* objects
static void U_CALLCONV deleter(void*);
};
#endif